There is currently no information on the internet showing the meaning of friendship in Japanese. However, if you translate friendship to Japanese, it will be ??. You can use the Google Translate to help you in translations.
friendship is important in japan and usually shows a bigger connection or bonding between humans and there family pets or even friends(friendship is relationship between humans and there other associations in japan)
At a personal level, it means "I got your back, and you can lean on me if you need help". On a national/govt. level it means, a relationship that includes safety and security, as well as economic ties.